My favourite would probably be the Huna Metru AND Turaga. I just love the way the Turaga version looks so tribal and the Huna Metru just looks so... uh I don't know, AMAZING!!! And I also LOVE the mask power too. turn invisibleThat's why my self MOC has a spray painted White Huna Metru. Yeap.

From set wise: Kanohi Mahiki, just looks so streamlined and handsome (like Matau is)Just the mask itself: Kanohi Avohkii, gives me that samurai vibe that fits so well with its hero and fits also with mocs pretty well. Power wise: Mask of Creation, you are basically God with this mask.